Display screen or portion thereof with transitional graphical user interface



FIG. 1 is a front view of a display screen or portion thereof withgraphical user interface, showing a first image of a sequence for ournew design;

FIG. 2 is a second image thereof;

FIG. 3 is a third image thereof;

FIG. 4 is a fourth image thereof;

FIG. 5 is a fifth image thereof; and,

FIG. 6 is a sixth image thereof.

The broken line showing the electronic device is provided for thepurpose of illustrating environmental structure; whereas all otherbroken lines illustrate portions of the display screen with graphicaluser interface. No subject matter depicted in any of the aforementionedbroken lines forms part of the claimed design.

The appearance of the transitional image sequentially transitionsbetween the images shown in FIGS. 1-6. The process or period in whichone image transitions to another image forms no part of the claimeddesign.

CLAIM The ornamental design for a display screen or portion thereof withtransitional graphical user interface, as shown and described.